Heavy Keystone

 is an item in Tyranny.

Description
A faintly-glowing sigil has been carved into this small, weathered shard. Stones like this are not uncommon in the Oldwalls, and often fit as keystones into larger structures. Despite its size, this stone is surprisingly heavy.

Use

 * A Breach Between Worlds: Found at Blade Grave Oldwalls - West in the chest upstairs.